FEPA White Corundum Grain Grit
Description:
White corundum grain uses high-quality alumina powder as raw material, smelted in an arc furnace at a high temperature of 2200 degrees to fully melt it, and then cooled naturally or cooled by water to fully crystallize the smelted alumina liquid. After the alumina powder is fully smelted, crystallized and cooled, it becomes the original block of white corundum. After the original block of white corundum grit is crushed by a jaw crusher, it is deeply screened in a five-screen vibrating screen in strict accordance with industry standards to obtain white corundum sand of different sizes. The proportion of basic particles and mixed particles in our factory’s particle size sand far exceeds the national standard, the particle size is more concentrated, and the use effect is better.
The Al2O3 content of white corundum grain is greater than 99%, and its hardness is higher than that of brown corundum, but its toughness is not as good as that of brown corundum. The Fe2O3 content of white corundum grit is very low, which is suitable for sandblasting operations where iron residue is strictly prohibited. At the same time, the material of white corundum is relatively hard, which is suitable for sandblasting with most sandblasting machines. It is also used as grinding and polishing materials, precision casting sand, spraying materials, chemical catalyst carriers, functional ceramics, refractory materials, etc.
Available Grain Sizes for White corundum grain:
| Fraction | 0-1mm 1-3mm 3-5mm 5-8mm | |
|---|---|---|
| Fine Powder | 200#-0 320#-0 | |
| Grit | 8# 12# 14# 16# 20# 24# 30# 36# 46# 54# 60# 70# 80# 90# 100# 120# 150# 180# 220# 240# | |
| Micro Powder | JIS Standard | #240 #280 #320 #360 #400# #500 #600 #700 #800 #1000 #1200 #1500 #2000 #2500 #3000 #4000 #6000 #8000 #10000 |
| FEPA Standard | F230 F240 F280 F320 F360 F400 F500 F600 F800 F1000 F1200 F1500 | |
Chemical Analysis for White corundum grain:
| Grain Size | Chemical Composition (%) | |||
|---|---|---|---|---|
| Al2O3 | Fe2O3 | Na2O | SiO2 | |
| Fraction | ≥99 | ≤0.08 | ≤0.35 | ≤0.08 |
| Fine Powder | ≥98.5 | ≤0.15 | ≤0.40 | ≤0.08 |
| Grit | ≥99 | ≤0.1 | ≤0.35 | ≤0.08 |
| Micro Powder | ≥98 | ≤0.1 | ≤0.40 | ≤0.08 |
Physical Properties for White corundum grain:
| Mohs Hardness | 9.0 |
|---|---|
| Bulk Density | 1.55-1.95g/cm3 |
| True Density | 3.95g/cm3 |
| Volume Density | 3.60 |
| Melting Point | 2250℃ |
| Maximum Use Temperature | 1900℃ |
Common uses of White corundum grain:
1. Surface processing: removal of metal oxide layer, carbide black skin, metal or non-metal surface rust, such as gravity die-casting mold, rubber mold oxide or release agent removal, ceramic surface black spots, uranium color removal, painting rebirth
2. Beautification processing: matte or matte treatment of various gold, K gold jewelry, precious metal products, matte processing of non-metals such as crystal, glass, corrugated, acrylic, and can make the surface of the processed object metallic luster
3. Etching processing: etching art of jade, crystal, agate, semi-precious stone, seal, elegant stone, antique, marble tombstone, ceramic, wood, bamboo, etc.
4. Pre-treatment processing: Teflon (TEFLON), PU, rubber, plastic coating, rubber roller (ROLLER), electroplating, metal spray welding, titanium plating, etc. before treatment to increase surface adhesion.
5. Burr processing: burr removal of bakelite, plastic, zinc, aluminum die-casting, electronic parts, magnetic cores, etc.
6. Stress relief processing: Stress relief processing for parts in aerospace, national defense, and precision industries, such as rust removal, paint removal, and renovation.
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